It's geometry! It's knitting! It's—hyperbolic crochet! Artist and science writer Margaret Wertheim shows you how to represent a hyperbolic plane using crochet hooks and yarn. Beginning with a simple crochet chain, learn how to create a geometric shape with a constant negative curvature just by adding stitches.

Tinkerer, programmer, and musician Ken Murphy shows how to build electromechanical "bugs" built from scavenged materials and powered with a single coin-cell battery. When the Blinkybug's wire antennae detect motion from air currents or vibrations, the bug comes to life, with its LED eyes blinking in rhythmic patterns.

PETER WHITEHEAD is an instrument builder, performer, and composer. His singular instruments, often based on folk instruments from around the world, feature unusual found materials.
Among his many instruments are the Heart Banjo, made from a baking tin; the Lawn Lyre, made from an old lawnmower and a metal oil pan; and the Spoonharp, made from a five-gallon metal drum, a eucalyptus branch, and kitchen spoons.
Originally from England, Whitehead is now based in the San Francisco Bay Area. Founding member of the Mobius Operandi performance group, he also performs regularly with Closer To Carbon, an improvisational trio.

Webcasts made possible through the generosity of the Gordon and Betty Moore Foundation, the Jim Clark Endowment for Internet Education, the McBean Family Foundation.

Bandwidth and infrastructure support for connectivity to the California Research and Education Network and to other Internet2-connected networks provided by the Corporation for Educational Networks Initiatives in California (CENIC).